JPS6339695Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a strobe light emitting unit that is movable between a storage position stored in a camera body and a protrusion position protruding from the camera body and is biased in the direction of the protrusion position; The light emitting part is movable between a locking position where the light emitting part is locked in the storage position against the biasing force and a release position where the light emitting part is released from the lock, and includes a locking member that is biased in the direction of the locking position. The present invention relates to a strobe light emitting part protrusion device for a camera with a built-in strobe.

Conventionally, as this type of device,
The one in Publication No. 1 is known. This device employs a constantly-released electromagnet to control the locking member,
By energizing the electromagnet, the locking member at the locking position is attracted and moved toward the release position. However, this movement requires a large attractive force, and therefore it is necessary to supply a large excitation current to the electromagnet. In addition to the locking member itself being biased toward the locking position, the protruding member in the storage position is strongly biased in the direction of the protruding position, and this protruding member and the locking member in the locking position are This is because the engagement force between the two is quite large.

An object of the present invention is to provide a strobe light emitting part protrusion device that consumes less power.

Embodiments of the present invention will be described below with reference to the drawings, and the operation of the present device will be explained separately depending on the brightness of the object and the degree of consumption of the power supply voltage.

(1) Natural light photography - when the subject is of high brightness Figure 1 shows the control circuit of the present invention. Press down the shutter button a little to turn on power switch 1.
Therefore, the voltage of power supply 2 is applied to the control circuit.
At this time, switch 51 is OFF and switch 6 is ON. Since the subject is of high brightness, the CDS 5 illuminated by the incident light has a low resistance. At this time, since the changeover switch 3 is connected to the terminal 3b, a divided voltage of the power supply voltage by the resistor 4 and the CDS 5 in a low resistance state is applied to the non-inverting input of the comparator 8. Since the resistance of CDS5 is low, the reference power supply 5 is applied to the inverting input of comparator 8.
Voltage lower than 3. Therefore, the output of comparator 8 is
Since the level is low, switch the shooting mode switch 1.
2 is connected to the terminal 12b, and the pop-up interlocking switch 14 is also turned on, but since the output of the comparator 8 is at a low level, the pop-up control magnet 13 is not excited. In this embodiment, the electromagnetic structure is of a constant attraction type, and the strobe light emitting part 26 is designed to protrude when the magnet 13 is excited, so that when the subject is of high brightness, the strobe light emitting part 26 will not protrude. There isn't.
By further pressing down the shutter button, the front shutter curtain starts running and the discharge switch 6 is turned OFF.
Further, the changeover switch 3 is now connected to the terminal 3a. The time setting capacitor 7 is charged via the CDS 5, and when the charging voltage of the capacitor 7 reaches the voltage value of the reference power supply 10 in a time corresponding to the resistance value of the CDS 5 depending on the subject brightness, the output of the comparator 9 is
High level and shutter control magnet 1
1 is excited, the shutter trailing curtain runs, and automatic exposure is performed. After that, when the shutter button is released, the power switch 1 is turned off, the changeover switch 3 is connected to the terminal 3b, and when the film is wound, the discharge switch 6 is turned on, shorting the time setting capacitor and discharging its charge. It discharges and returns to its original state and waits for the next shot.

(2) Flash photography - When the subject is in low brightness and the power supply voltage is sufficient, press down the shutter button slightly to turn on the power switch 1.
Turn on. Since the subject brightness is low, the CDS 5 has a high resistance, and the non-inverting input of the comparator 8 is higher than the inverting input, so its output becomes High level. As a result, the pop-up control magnet 13 is energized. FIG. 2 shows a pop-up mechanism of the strobe light emitting section 26 driven by the control circuit shown in FIG. Figure 3 shows the strobe light emitting section 26 as in Figure 2.
This is what it looks like when it is popped down and locked. The iron piece lever 2 is activated by the excitation of the magnet 13.
0 is released, the lever 20 is rotated counterclockwise in FIG. 2 by the bias force of the spring 21, and when the momentum is sufficiently increased, the portion 20a pushes the portion 22c of the lock lever 22. The magnet 13 is a permanent magnet that attracts the iron piece lever 20 when it is not energized, but loses its attractive force when it is energized, that is, when it is energized in the opposite direction to that of the permanent magnet. As a result, the lock lever 22 rotates counterclockwise around the shaft 22d, and the lock pin 27 is unlocked, so that the guide plate 24 is raised by the bias force of the spring 25, and the strobe light emitting section 26 is popped up from the camera body. (protrude). Figure 4 shows the strobe light emitting section 2.
6 is shown being popped up. Along with this pop-up operation, the lock pin 27 also rises, so the reset lever 28 is moved to the diagonal edge 28.
Clockwise rotation is allowed by the amount cut out by a. The switching lever 29, which is biased by the spring 30, therefore slides to the left in FIG.
By this slide, the pop-up interlocking switch 14 (Fig. 1), which is interlocked with the switching lever 29, is turned OFF.
At the same time, the magnet 13 is de-energized and the switch 51 (FIG. 1) is turned on. Also, the part 28b of the reset lever 28 is the iron piece lever 20.
20a, the iron piece lever 20 moves to the second position.
Rotate clockwise in the figure to bring the iron piece lever 20 into contact with the magnet 13. At this time, magnet 13
is in a de-energized state, so the iron piece lever 20
is attracted by the magnet 13 and returned to its original state. When the shutter button is pressed down further, the front shutter curtain starts running, and the discharge switch 6 is turned on.
When the switch is turned OFF, the connection of the changeover switch 3 is changed to the terminal 3a. As mentioned above, the switch 51 is turned on by sliding the switching lever 29, but this
The time setting capacitor 7 comes to be charged via the parallel circuit of the CDS 5 and the resistor 52. capacitor 7
When the charging voltage reaches the voltage of the reference power source 53, the output of the comparator 9 becomes High level, the shutter control magnet 11 is excited, the shutter trailing curtain runs, and exposure is performed. If the subject brightness is high,
The charging current to capacitor 7 is mainly of low resistance value.
Although it depends on the current flowing through the CDS 5, when the subject brightness is low and the resistance of the CDS 5 is high, the capacitor 7 is mainly charged by the current flowing through the resistor 52. This prevents the time required for the charging voltage of the capacitor 7 to reach the voltage of the reference power supply 10 to be longer than a predetermined time. The strobe light emitting unit 26 is charged so that it can always emit light before being popped up. The shutter control magnet 11 is excited and a flash is emitted only when the shutter is popped up. Therefore, when the shutter button is pressed, if the CDS 5 and comparator 8 detect that the subject is of low brightness, the strobe light emitting section 26 pops up, and when the shutter button is pressed further, the shutter control magnet is energized and the rear curtain runs. At the same time, the strobe light emitting section 26 that pops up is flashed. Since there is a slight mechanical delay from the excitation of the shutter control magnet 11 until the trailing curtain starts running, the trailing curtain actually runs after the strobe light emitting section emits a flash. When the shutter button is released and the film is wound, the control circuit shown in FIG. 1 returns to its original state as described above. Also, when the light emitting unit 26 is pushed down and stored in the camera storage position after flash photography, the lock lever 22 locks the lock pin 27 as shown in FIG. Then, the switching lever 29 returns to its original position as shown. In conjunction with the return of the lever 29, the switch 14 is turned on and the switch 51 is turned off (the state shown in FIG. 1).

(3) Flash photography - When the subject is of low brightness and the power supply voltage is low, power switch 1 is activated by pressing down the shutter button.
When turned ON, the control circuit shown in FIG. 1 becomes operational. When the subject brightness is low, the resistance value of the CDS 5 is high, and when the power supply voltage is originally sufficient, the output of the comparator 8 becomes High level as described above. However, if the power supply voltage is dropping, even if the resistance value of the CDS 5 is high, the non-inverting input voltage of the comparator 8, which is a voltage obtained by dividing the power supply voltage, cannot become higher than the voltage of the reference power supply 53. The voltage of the reference power source 53 is set so that the above-described operation occurs when the power source voltage drops below the voltage required for strobe photography. Therefore, the pop-up control magnet 13 is not excited and the strobe light emitting section 26 does not pop up. By pressing down the shutter button further, switch 3 will switch to terminal 3.
a, the front curtain of the shutter starts running, the switch 6 is turned off, the capacitor 7 is charged via the CDS 5, and after a period of time corresponding to the subject brightness has elapsed, the output of the comparator 9 becomes High level and the shutter control magnet 11 is connected. It is energized and runs on the rear shutter curtain to perform automatic exposure control. Thereafter, the pressure on the shutter button is released and the film winding operation returns the circuit shown in FIG. 1 to its original state. When the power supply voltage is so low that strobe photography cannot be performed, photography of a low-luminance subject is performed using natural light appropriate exposure control without strobe photography. In addition,
If the brightness of the subject is low, but the subject is naturally exposed due to a drop in power supply voltage, it is desirable to display this in the viewfinder or to lock the shutter button.

Incidentally, the photographing mode selection switch 12 can be configured to be manually selectable. To operate as described above, selection switch 12 must be connected to terminal 12.
Connect it to b. If you want to pop up the strobe light emitting unit 26 and take flash photography regardless of subject brightness and power supply voltage drop, manually press the selection switch 1.
2 to the terminal 12a, the pop-up control magnet 13 is excited, and the strobe light emitting section 2
6 pops up and becomes ready for flashing, and when the shutter control magnet 11 is excited, it flashes. Furthermore, if the selection switch 12 is connected to the terminal 12c, the magnet 13 will be switched on at any subject brightness.
is not excited, so natural light photography can always be performed.

As described above, according to the present invention, an electromagnet is not directly used to move the locking member that locks the strobe light emitting unit in the storage position to the release position, but instead an electromagnet is used at an interference position that interferes with the locking member. A lock release member that is movable to a non-interference position and is biased in the direction of the interference position is prepared, and the lock release member locked in the non-interference position is released by an electromagnet to store energy. Since the structure is configured so that the movement by force is started and when the momentum increases, the locking member is interfered with and moved to the release position, so the number of electromagnets described above is small, and the protruding position of the strobe light emitting part with low power consumption can be achieved. is obtained. Furthermore, a return means interlocked with the strobe light emitting section is provided, and this return means is interlocked with the movement of the strobe light emitting section to the protruding position to interfere with the unlocking member and return it from the interference position to the non-interference position. With this structure, it is possible to obtain a strobe light emitting part protruding device that is simple in structure and ensures reliable operation. In particular, in the above embodiment of the present invention, the return means is moved to a position where it does not interfere with the unlocking member in conjunction with the manual movement of the strobe light emitting unit to the storage position, so that the return means is biased. Therefore, when the unlocking member is moved to the non-interference position, it can be reliably locked by the control means electromagnet 13.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a control circuit of an embodiment of a camera with a built-in strobe according to the present invention, FIG. 2 is a diagram showing a pop-up mechanism of a strobe light emitting section controlled by the control circuit of FIG. FIG. 4 is a diagram showing the pop-up mechanism shown in FIG. 2 with the light-emitting part being popped up, and FIG. 4 is a diagram showing the pop-up mechanism of FIG. 2 with the light-emitting part being popped up. Explanation of symbols of main parts, Figure 1...Control circuit,
13...Electromagnet, 20...Latch release member, 26...
...Strobe light emitting section, 28, 29...Returning member.

Claims (1)

[Claims for Utility Model Registration] A strobe light emitting unit that is movable between a storage position housed in a camera body and a protrusion position protruding from the camera body and has a driven part; a strobe light emitting unit biasing means for biasing the strobe light emitting unit; a locking position for locking the strobe light emitting unit in the storage position against the biasing force of the strobe light emitting unit biasing unit; and a release position for releasing the lock. a locking member that is movable toward the locking position; a locking member biasing means that biases the locking member in the direction of the locking position; a lock release member movable between a first interference position where the lock release member is moved from the lock position to the release position and a first non-interference position where the lock release member is moved toward the first interference position; a locking release member biasing means; a locking state in which the locking release member is locked in the non-interference position against the biasing force of the locking release member biasing means; and a release state in which the locking is released. a second interference position that interferes with the lock release member; and a second interference position that interferes with the lock release member.
It is movable to a second non-interference position where there is no interference,
a return means having a drive surface that contacts the driven part of the strobe light emitting section; and a return means urging means for urging the return means in the direction of the second interference position, and the control means is configured to control the movement of the strobe light by supplying electric power to the second interference position. The locking of the locking release member in the first non-interference position is released, and the locking release member moves with acceleration by consuming the urging force of the locking release member urging means. , when reaching a predetermined speed, collides with the locking member and moves to the first interference position, and the locking member is moved from the locking position by the collision and movement of the lock release member. The strobe light emitting unit is released from the storage position by moving the locking member and the strobe light emitting unit is moved to the release position and at the same time stores the biasing force of the locking member biasing means. The return means moves to the protruding position by consuming the urging force of the part urging means, and the return means consumes the urging force of the return means urging means in conjunction with the movement of the strobe light emitting part. thereby moving from the second non-interference position to the second interference position, and at the same time applying a part of the urging force of the return means urging means to the driven part of the strobe light emitting part from the drive surface of the return means. This assists the movement of the strobe light emitting unit in the direction of the protruding position, and the locking release member in the first interference position prevents the return means from moving in the direction of the second interference position. By colliding with the return means and consuming the urging force of the return means urging means, the return means moves from the first interference position to the first non-interference position and is locked by the control means, and at the same time the lock The biasing force of the member biasing means is stored, and further, by manually moving the strobe light emitting unit from the protruding position to the storage position, the biasing force of the strobe light emitting unit biasing unit is reduced. The force is accumulated, and at the same time, the driven part of the strobe light emitting unit presses the drive surface of the return means, and the return means is moved from the second interference position to the second non-interference position, thereby energizing the return means. By accumulating the biasing force of the means and moving the strobe light emitting part to the storage position, the locking member biasing means consumes the biasing force to move the locking member from the release position. A strobe light emitting unit protruding device for a camera with a built-in strobe, characterized in that the strobe light emitting unit is moved to a locking position and the strobe light emitting unit is locked.